3 #ifndef ALIHLTCOMPONENTHANDLER_H
4 #define ALIHLTCOMPONENTHANDLER_H
5 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
6 * See cxx source for full Copyright notice */
8 /** @file AliHLTComponentHandler.h
9 @author Matthias Richter, Timm Steinbeck
11 @brief Global handling of HLT processing components
12 @note The handler is part of the interface and both used in the
13 Online (PubSub) and Offline (AliRoot) context.
19 #include "AliHLTDataTypes.h"
20 #include "AliHLTLogging.h"
22 class AliHLTComponent;
23 struct AliHLTComponentEnvironment;
24 struct AliHLTComponentDataType;
27 * @class AliHLTComponentHandler
28 * The component handler controls all the processing components available in
29 * the system. It also controls the component shared libraries.
30 * @ingroup alihlt_component
32 class AliHLTComponentHandler : public AliHLTLogging {
34 /** standard constructor */
35 AliHLTComponentHandler();
37 AliHLTComponentHandler(AliHLTComponentEnvironment* pEnv);
39 virtual ~AliHLTComponentHandler();
42 * Set the environment for the HLT framework.
43 * The environment mainly consists of function pointers for the integration
44 * of the HLT framework into a system like the PubSub online system or
45 * AliRoot offline system.
46 * @param pEnv pointer to @ref AliHLTComponentEnvironment structure
49 void SetEnvironment(AliHLTComponentEnvironment* pEnv);
52 * Load a component shared library.
53 * The component library needs to be loaded from the ComponentHanler in order
54 * to automatically register all components in the library.
55 * Registration is done by passing a sample object of the component to the
56 * handler. The object has to be valid during the whole runtime and should
57 * thus be a global object which is ONLY used for the purpose of registration.
58 * This also ensures automatically registration at library load time.
59 * @param libraryPath const char string containing the library name/path
60 * @return 0 if succeeded, neg. error code if failed
62 int LoadLibrary( const char* libraryPath );
65 * Unload a component shared library.
66 * All components will be de-registered.
67 * @param libraryPath library name as specified to @ref LoadLibrary
68 * @return 0 if succeeded, neg. error code if failed
70 int UnloadLibrary( const char* libraryPath );
73 * Schedule a component for registration.
74 * Full registration will be done after successfull loading of the shared
76 * @param pSample a sample object of the component
77 * @return neg. error code if failed
79 int ScheduleRegister(AliHLTComponent* pSample );
82 * Register a component.
83 * Registration is done by passing a sample object of the component to the
84 * handler. The object has to be valid during the whole runtime and should
85 * thus be a global object which is ONLY used for the purpose of registration.
86 * @param pSample a sample object of the component
87 * @return neg. error code if failed
89 int RegisterComponent(AliHLTComponent* pSample );
92 * Registers all scheduled components.
94 int RegisterScheduledComponents();
97 * Deregister a component.
98 * @param componentID ID of the component
99 * @return neg. error code if failed
101 int DeregisterComponent( const char* componentID );
104 * Add standard components
105 * The standard components are part of the libHLTbase library and
106 * need therefore a special handling.
108 int AddStandardComponents();
112 int DeleteStandardComponents();
115 * Find the ID of a component with the given output data.
116 * @param dtype data type descriptor
117 * @param prevType can be used to iterate if there are multiple components
118 * with the same output data type.
119 * @return component id
121 //const char* FindComponentType( AliHLTComponentDataType dtype,
122 // const char* prevType = NULL )
126 * Create a component of the given name (ID).
127 * The method tries to find a registerd component of id \em componentID and
128 * calls the \em Spawn method of the template component. After successful
129 * creation of a new object, the Init method is called in order to initialize
130 * the environment and the component arguments. <br>
131 * The environment is the same for all components, but each component can
132 * have an additional private parameter \em pEnvParam.<br>
133 * The component arguments consist of an array of strings and the array size
134 * in the usual manner of the main() function.
135 * @param componentID ID of the component to create
136 * @param pEnvParam environment parameter for the component
137 * @param argc number of arguments in argv
138 * @param argv argument array like in main()
139 * @param component reference to receive the create component instance
140 * @return component pointer in component, neg. error code if failed
142 int CreateComponent( const char* componentID, void* pEnvParam,
143 int argc, const char** argv, AliHLTComponent*& component );
146 * Create a component of the given name (ID).
147 * Introduced for backward compatibility.
148 * @param componentID ID of the component to create
149 * @param pEnvParam environment parameter for the component
150 * @param component reference to receive the create component instance
151 * @return component pointer in component, neg. error code if failed
153 int CreateComponent( const char* componentID, void* pEnvParam,
154 AliHLTComponent*& component )
156 return CreateComponent( componentID, pEnvParam, 0, NULL, component );
160 * Print registered components to stdout.
166 * Announce version and compilation info of the base library.
168 int AnnounceVersion();
175 * @param componentID ID of the component to find
176 * @return index, neg. error code if failed
178 int FindComponentIndex(const char* componentID);
182 * @param componentID ID of the component to find
185 AliHLTComponent* FindComponent(const char* componentID);
188 * Insert component to the list
189 * @param pSample sample object of the component
190 * @return neg. error code if failed
192 int InsertComponent(AliHLTComponent* pSample);
195 * Close all libraries.
196 * @return neg. error code if failed
198 int UnloadLibraries();
201 * Compount descriptor for component libraries
203 struct AliHLTLibHandle {
204 AliHLTLibHandle() : handle(NULL), name(NULL) {}
206 void* handle; //! transient
207 /** name of the library, casted to TString* before use */
208 void* name; //! transient
211 /** list of registered components */
212 vector<AliHLTComponent*> fComponentList; // see above
213 /** list of scheduled components */
214 vector<AliHLTComponent*> fScheduleList; // see above
215 /** list of libraries */
216 vector<AliHLTLibHandle> fLibraryList; // see above
217 /** running environment for the component */
218 AliHLTComponentEnvironment fEnvironment; // see above
219 /** list of standard components */
220 vector<AliHLTComponent*> fStandardList; // see above
222 ClassDef(AliHLTComponentHandler, 0);